How does Python share memory among multiple processes?

Question

I read that processes operate on seperate memory spaces (link). However the multiprocessing package of python offers shared memory (multiprocessing.Value, multiprocessing.Array).

• Where (in which process) is this data stored?
• Is the data accessed by reference by the child processes?

Answer 1

The data is allocated in a shared, anonymous memory map created through the mmap module. You can see the code here and here.